Trailer Wiring. DJ2 MEMBER; 2002 CHEVROLET SILVERADO; I have a friend with a chevy truck and his trailer light plug has quit working. It was working then when they went on a trip last week it start to have intermittent problems now does not work at all. 2003 Chevy Silverado V8 Four Wheel Drive Automatic 140000 miles the truck has a factory. Reviewed By Julie B (Greenview, IL) Reviewed for a 2018 Chevy Silverado —1/25/2018 8:44 PM. The t connector I ordered was a 5 way (just like the 4 way but has reverse light wire also). This allowed seemless integration of my rear bumper step lights on my truck without having to touch the factory wiring. One superb way of keeping your tail light working is through the use of a handy Dorman tail light wiring harness. A wiring harness is designed to provide your tail light with the power it needs to illuminate by ensuring a smooth flow of electrical energy..